OPEN EX vs Gantt Chart
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OPEN EX
Read full descriptionHide full description
OPEN EX ビューワーとは OPEN EXシステムを通して、エクステリア工事の物件情報や様々なファイルを共有できるアプリです。 数が多くて整理の大変な図面や写真ファイルをクラウド上で一元管理することで、ミスやロスを削減しましょう! OPEN EX ビューワーがあれば、アプリからファイルを直接アップロードして共有することができます。 最新の図面や仕様書なども、クラウドでスムーズに最新の内容を共有する事ができます。 PDFや画像ファイルだけでなく、BIMxファイル(パースと図面が完全連動)も簡単に開く事ができ、施行着手までのスピードもUPします。
Gantt Chart
Read full descriptionHide full description
A simple, easy-to-read Gantt chart app for iPhone and iPad. See your project schedule as bars and adjust dates directly with your finger. ■ Pro Schedules for Real Work (Pro, NEW) • Turn your schedule into a PDF to share with clients, managers, or partners, or print it • Start from templates: home renovation, website project, event, moving, and exam prep • Task dependencies: when a task runs long, the tasks after it shift automatically (shown with arrows) • Pro includes everything in Premium. Premium owners can upgrade to Pro at a reduced price ■ Send as a File or Link (Premium) • Send a project as a file or a link by AirDrop, Mail or Messages • Open or paste the link and the project is added in the other person’s app (no server needed) • Save to File exports the project as JSON wherever you like ■ Attach Images (Premium) • Attach images to tasks (up to 10 per project) • See every task’s images together in the Images view • In projects shared via Google Drive, images reach the other person too ■ Now on Mac too • The same app runs on your Mac. If you already own Premium, everything is unlocked there as well ■ Clear Gantt chart • Switch between day, week and month views • Today is marked with a red line; weekends are shaded • Task names and dates stay pinned while you scroll in any direction • Milestones (◆) supported ■ Adjust schedules by touch • Touch and hold a bar and drag to move it by days • Drag either end of a bar to lengthen or shorten it • Tap to edit details ■ Progress and checklists (checklists: Premium) • Completion checkmarks and progress for every task • Add a checklist to a task and let its completion drive progress automatically • Overall project progress is calculated for you ■ Reminders (Premium) • Get notified on the start date, the day before, the end date, the day before the end, or at a custom time • Move the schedule and reminders follow along ■ Share with your team (Premium) • Share and sync projects with others using Google Drive • Edits to different tasks made at the same time are both kept • Each person who shares needs Premium ■ Delay tracking & working days (Premium) • Tasks behind schedule turn red, and overdue tasks stand out • Skip weekends and public holidays (about 250 countries and regions) and count durations in working days • Bars snap to working days when you move them ■ Designed for iPad too • Project list and Gantt chart side by side • Dark Mode supported The free version includes 1 project with up to 5 tasks. Premium (one-time in-app purchase) unlocks unlimited projects and tasks, plus checklists, reminders and sharing. No account needed. Your data stays on your device.
Screenshots
Verdict
The clearest difference is in-app purchases: OPEN EX at none against Gantt Chart's 3. OPEN EX also leads on iOS requirement (15.0 vs 18.0). Gantt Chart's advantage is update cadence (every 2 days vs every 5 weeks). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Gantt Chart sells 3 one-off in-app purchases. OPEN EX asks for nothing beyond the download.
OPEN EX ships an update every 5 weeks, Gantt Chart every 2 days. The most recent releases landed on November 8, 2026 and November 13, 2026 respectively.
| Parameter | OPEN EX | Gantt Chart |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 weeks | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 44 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | RIK Corporation | YOSHIYUKI UEMATSU |
In-app purchases
OPEN EX
No in-app purchases
Gantt Chart
- Upgrade to Pro$2.99
- Premium$2.99
- Pro$4.99









